Scarifier



Nov. 29, 1927. 1,651,068

0. J. NITARDY scARIFIE'R Filed Oct. 25. 1926 fitter s i will not .be' easily projected Patented Nov. 29, 1927.

.umrso HIATENT I car es.

.i LOTTO J. .NITARD.Y,JOEiMINNE1-&BOIIS; MINNESOTA.

21-.SCAR1EIER.

i Application filed October; 23,

The principal: objections to s carifiersiin I I a general use at this time are,flfirst. that the comparatively short time, :an'dsecoiidly thatdu'e to the construction flof theflframe and.- teeth,-th'ei teeth 'nto theground, bounce-for some time onj he teeth-become dull in a but willtend toroad, especially, if thesurface is hard.

fuThe main ob] ectof my invention is t9 provide a simple but highly efiicient scarifier,

.having aisupporting' frame and teeth mou'nt overcom ng the disadvantages above renu- ..merated, and constructed insuch a manner that ,theteeth .will ,be automatically" sharp- .ened. asthe device 1s .beingiutiliz'ed. .A further. object is. to. provide a scarifier .ed therein,.so.constructed. and so related that ;t-he points'of, the teeth will be quickly forced into theground whenlthe device is. dragged in operative position.

. i A. still furtherv object isv maintained .con-

' teeth work.

These and will be apparent from the following description made in connection with the accompanying drawings, wherein like characters refer to similar parts throughput the several views, and in which:

Fig. 1' is a plan view of the rear end of a Fordson tractor with a preferred embodiment of my device attached thereto;

Fig. 2 is a vertical section taken on the line 22 of Fig. 1, showing the teeth in operative position; an

Fig. 3 is a vertical section through the scarifier, showing the teeth in position to be projected into the ground.

Referring to the drawings in detail, the rear end of a Fordson tractor is illustrated, including the rear wheels 4, the axle housing 5, the transmission and differential housing 6, and the draw bar cap 7 secured to the lower rear portion of the transmission and difierential housing.

My device may be attached to a draft vehicle in any suitable manner. In the drawings I provide a substantially rigid frame comprising a pair of side bars 8, secured at their forward ends to the axle housing 5 by U-bolts 9, and having the transverse ;'wi'de beam. or'bar16 istofprovide a scari -fier. wherein .the angle Iof'. the inclination 'of the teeth to" the ground.

otherobjects of the invention 51926.. serial No.148;609.

U-shaped beam 10' se'cured thereacross. The vertical ends of beam 10 are :provided' ith a pluralityof apertures 10. arranged 'in :the :arc' 'of a 'circleithrough which .boltsapass to secure'arms 8" rigidly. Beam""1() is boltedror :f 'pinneda't itscentral po'rtionto'the draw bar 9 are secured across ';:the rear ends or" frame members 8 supporting: the: centr ally disposed wor1n12. having the operating wheel *13 se nuredtdthe inner end thereof.

.;pair of oppositely "alined bearings "14 "are-carried on the under s'ideof: frame bars 8..in which the rock shaft15iofmy scarifi'er proper is 'j ourn'aled.

"* The scarifier frame comprises a; relatively having therein a plurali-ty "of *arcuate. slots .arran'ged in staggeried "positiomias shown in'F ig. 1.. "The rear side of -bar"16"has a: plurality of: lateral projections 16 through which the slot's'for the rear line of teeth are made. Bar "16 is, prefer- "ably rigidly connected to'rock -shaft 15 by means of a "pair -01? heavy arms 17 which may be formedintegrally therewith, onsecured as desired. The.beam"thus swings on theaxis of shaft 15 andmay be held and swung to various positions: by means .-of wornr12 engaging the gear segment 18 rigidly secured to rock shaft 15.

My scarifier teeth 19 are constructed from arcuate bars or plates, and when mounted in operative position extend in the circumference of circles approximately concentric with the axis of rock shaft 15. The teeth 19 ma be rigidly secured to bar 16 by any suitable means, such as the wedges 20. The bottom edges of teeth 19 are formed in straight lines extending horizontally and substantially parallel to the surface of the road when in operative position, and forming the sharp forwardly disposed cutting points 19.

Beam 16 is provided with a plurality of depending reinforcements 16 each disposed immediately rearward of one of the arcuate slots adapted to receive teeth 19. Reinforcements 16 are contacted by the rear side of the teeth and add considerably to the durability and efliciency of the device. Beam 16 can be constructed from relatively thin material since the thickened reinforcing portions afford the supports necessary for the dragging of the teeth through the ground.

In operation, bar-16 may be readily swung upwardly or downwardly on the rock shaft 7 A pair {of spac'edtransverse "bars 1:11

15 by means of the worm 12. It will be seen that the longitudinal center lines of teeth 19 not only extend in circles concentric with the axis of rock shaft 15, but that due to the construction of the scarifier frame the teeth are swung in the path of circles concentrio with the pivot. Thus, when the teeth are swung downwardly ground, due to the straight force exerted by the draft vehicle and the construction previously referred to. The shape of teeth 19 shaft 15 keeps the angle of their inclination to the ground constant regardless at what depth they work. When in operative position, as shown in Fig. 2, the straight bottom edges of the teeth extend substantially horizontally, and it will be seen that the wear on the teeth will take place uniformly along the 7 bottom edges, thus always maintaining the sharp cutting points 19 From the foregoing description, it will be seen that I have invented a simple, but highly improved scarifier, the combination between the swinging frame and my arcuate teeth concentrically disposed relatively to the pivot of the frame being responsible for new and improved results.

It will, of course, be understood that various changes may be made in the form, details, proportions and arrangement of parts without departing from the scope of the invention.

.What is claimed is:

l. A scarifier having in combination a beam connected for swinging movement to a horizontal the sharp points 19 will be immediately forced and dragged into the pivot, a plurality of arcuatescarifying teeth carried by said beam, said teeth being disposed with their longitudinal center lines concentric with said pivot, and having straight low-er edges disposed at sharp angles to said center lines.

2. A scarifier having in combination a beam adaptedto be transversely disposed relatively to a draft vehicle, a relatively short arm rigidly carried by said beam pivoted for substantially vertical swinging movement, and a plurality of arcuate scarirelatively to the rock fying teeth rigidly carried by said beam constructed and disposed in such manner that their longitudinal center lines extend in the circumference of circles concentric with said pivot, said teeth having straightlower edges extending at sharp angles to the longitudinal center lines thereof and adapted to lie substantially parallel with the surface of the ground or road when being dragged through the same. V

3. A scarifier having in combination a beam adapted to be disposed transversely of a draft vehicle, means for swinging said beam on substantially a horizontal axis, said beam having therethrough a plurality of substantially arcuate slots, depending reinforcing means adjacent the rear of each of said slots, and a plurality ofarcuate scarifying teeth carried by said beam and extending through said slots, said teeth and said slots being so constructed that said teeth extend in circles concentric with the axis on which said beam swings.

OTTO J. N ITARDY. 

